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Orthopaedic Registries

AOSSM members interested in collecting patient-reported outcomes (PRO’s) and other objective outcome measures have several registry options available. The registry list is not intended to be comprehensive and does not imply endorsement by AOSSM.

AAOS Registry Program
Outcomes Based Electronic Research Database (OBERD)

International Knee Documentation Committee (IKDC)

A committee of international knee experts stewarded by AOSSM and our members created the International Knee Documentation Committee (IKDC) Subjective Knee Form. The IKDC form is knee-specific, patient-reported outcome (PRO) that measures symptoms, function, and sports activity. The form is a reliable and valid knee-specific measure of symptoms, function, and sports activity appropriate for patients with a wide variety of knee problems. The use of this instrument will permit comparisons of outcomes across groups with different knee problems.

Access, Licensing and Fees:

For investigators conducting academic research, the IKDC is available without a license or fee. Companies, vendors, or healthcare systems seeking use of the IKDC, please email AOSSM for details on licensing the instrument. Changes to the IKDC are strictly prohibited.


A modified version of the IKDC Subjective Knee Forms (Pedi-IKDC) was developed for use with children and adolescents between the ages of 10- and 18-years-old. The reliability and validity of the Pedi-IKDC are acceptable in a population of young patients with a variety of knee disorders.

AOSSM has several translations of the IKDC available in the following languages:

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